| 講演抄録/キーワード |
| 講演名 |
2007-10-25 14:40
[ポスター講演]Crosshole GPR monitoring of infiltration process in a vadose zone ○Hannuree Jang(Pukyong Nat. Univ.)・Seiichiro Kuroda(NIRE)・Hee Joon Kim(Pukyong Nat. Univ.) SANE2007-68 |
| 抄録 |
(和) |
An artificial groundwater recharge test was conducted in Nagaoka City in Japan, and time-lapse crosshole GPR data were collected to monitor the infiltration process in a vadose zone. Since electromagnetic wave velocities in a vadose zone are largely controlled by variations in water content, an increase in traveltimes is interpreted as an increase in saturation. In the test zone, the infiltrated water penetrated downward with an average velocity of about 2.7 m/h. A finite-difference time-domain method is applied using two-dimensional cylindrical coordinates to simulate radargrams associated with the advance of a wetting front during the filtration process. To accurately determine the water content profile, correct velocity analysis requires identification of first-arriving critically refracted waves from the traveltime profile. The standard zero-offset profiling for which all first arrivals are assumed to be direct waves, results in an underestimation of water content in a transition zone. |
| (英) |
An artificial groundwater recharge test was conducted in Nagaoka City in Japan, and time-lapse crosshole GPR data were collected to monitor the infiltration process in a vadose zone. Since electromagnetic wave velocities in a vadose zone are largely controlled by variations in water content, an increase in traveltimes is interpreted as an increase in saturation. In the test zone, the infiltrated water penetrated downward with an average velocity of about 2.7 m/h. A finite-difference time-domain method is applied using two-dimensional cylindrical coordinates to simulate radargrams associated with the advance of a wetting front during the filtration process. To accurately determine the water content profile, correct velocity analysis requires identification of first-arriving critically refracted waves from the traveltime profile. The standard zero-offset profiling for which all first arrivals are assumed to be direct waves, results in an underestimation of water content in a transition zone. |
| キーワード |
(和) |
time-lapse / crosshole / GPR / vadose zone / FDTD / / / |
| (英) |
time-lapse / crosshole / GPR / vadose zone / FDTD / / / |
| 文献情報 |
信学技報, vol. 107, no. 277, SANE2007-68, pp. 37-42, 2007年10月. |
| 資料番号 |
SANE2007-68 |
| 発行日 |
2007-10-18 (SANE) |
| ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
| PDFダウンロード |
SANE2007-68 |